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Pfizer Begins Coronavirus Vaccine Trial In U.S.

Footage issued by Britain's Oxford University shows a person injected as part of human trials in the U.K. to test a potential coronavirus vaccine last month. Pfizer on Monday began U.S. trials of another vaccine candidate. (Oxford University Pool via AP)
Footage issued by Britain's Oxford University shows a person injected as part of human trials in the U.K. to test a potential coronavirus vaccine last month. Pfizer on Monday began U.S. trials of another vaccine candidate. (Oxford University Pool via AP)

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